diff --git a/tempest/api/compute/admin/test_volume_swap.py b/tempest/api/compute/admin/test_volume_swap.py
index ed8cf20..5439ebe 100644
--- a/tempest/api/compute/admin/test_volume_swap.py
+++ b/tempest/api/compute/admin/test_volume_swap.py
@@ -82,6 +82,11 @@
        is attached to "instance1" and "volume2" is in available state.
     """
 
+    # NOTE(mriedem): This is an uncommon scenario to call the compute API
+    # to swap volumes directly; swap volume is primarily only for volume
+    # live migration and retype callbacks from the volume service, and is slow
+    # so it's marked as such.
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('1769f00d-a693-4d67-a631-6a3496773813')
     @utils.services('volume')
     def test_volume_swap(self):
@@ -136,6 +141,11 @@
         if not CONF.compute_feature_enabled.volume_multiattach:
             raise cls.skipException('Volume multi-attach is not available.')
 
+    # NOTE(mriedem): This is an uncommon scenario to call the compute API
+    # to swap volumes directly; swap volume is primarily only for volume
+    # live migration and retype callbacks from the volume service, and is slow
+    # so it's marked as such.
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('e8f8f9d1-d7b7-4cd2-8213-ab85ef697b6e')
     @utils.services('volume')
     def test_volume_swap_with_multiattach(self):
@@ -146,6 +156,8 @@
         volume1 = self.create_volume(multiattach=True)
         volume2 = self.create_volume(multiattach=True)
 
+        # TODO(mriedem): Speed this up by waiting for both servers to be active
+        # in parallel.
         # Boot server1
         server1 = self.create_test_server(wait_until='ACTIVE')
         # Attach volume1 to server1
diff --git a/tempest/api/compute/servers/test_device_tagging.py b/tempest/api/compute/servers/test_device_tagging.py
index 40681cb..d40f937 100644
--- a/tempest/api/compute/servers/test_device_tagging.py
+++ b/tempest/api/compute/servers/test_device_tagging.py
@@ -138,6 +138,9 @@
         except Exception:
             return False
 
+    # NOTE(mriedem): This is really more like a scenario test and is slow so
+    # it's marked as such.
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('a2e65a6c-66f1-4442-aaa8-498c31778d96')
     @utils.services('network', 'volume', 'image')
     def test_tagged_boot_devices(self):
diff --git a/tempest/api/compute/servers/test_server_actions.py b/tempest/api/compute/servers/test_server_actions.py
index f6494b5..f3d7476 100644
--- a/tempest/api/compute/servers/test_server_actions.py
+++ b/tempest/api/compute/servers/test_server_actions.py
@@ -265,6 +265,11 @@
 
         self.client.start_server(self.server_id)
 
+    # NOTE(mriedem): Marked as slow because while rebuild and volume-backed is
+    # common, we don't actually change the image (you can't with volume-backed
+    # rebuild) so this isn't testing much outside normal rebuild
+    # (and it's slow).
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('b68bd8d6-855d-4212-b59b-2e704044dace')
     @utils.services('volume')
     def test_rebuild_server_with_volume_attached(self):
diff --git a/tempest/api/compute/servers/test_server_personality.py b/tempest/api/compute/servers/test_server_personality.py
index 6f32b46..4f484e2 100644
--- a/tempest/api/compute/servers/test_server_personality.py
+++ b/tempest/api/compute/servers/test_server_personality.py
@@ -45,6 +45,10 @@
         super(ServerPersonalityTestJSON, cls).setup_clients()
         cls.client = cls.servers_client
 
+    # NOTE(mriedem): Marked as slow because personality (file injection) is
+    # deprecated in nova so we don't care as much about running this all the
+    # time (and it's slow).
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('3cfe87fd-115b-4a02-b942-7dc36a337fdf')
     def test_create_server_with_personality(self):
         file_contents = 'This is a test file.'
@@ -75,6 +79,10 @@
                              linux_client.exec_command(
                                  'sudo cat %s' % file_path))
 
+    # NOTE(mriedem): Marked as slow because personality (file injection) is
+    # deprecated in nova so we don't care as much about running this all the
+    # time (and it's slow).
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('128966d8-71fc-443c-8cab-08e24114ecc9')
     def test_rebuild_server_with_personality(self):
         validation_resources = self.get_test_validation_resources(
@@ -117,6 +125,10 @@
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.create_test_server, personality=personality)
 
+    # NOTE(mriedem): Marked as slow because personality (file injection) is
+    # deprecated in nova so we don't care as much about running this all the
+    # time (and it's slow).
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('52f12ee8-5180-40cc-b417-31572ea3d555')
     def test_can_create_server_with_max_number_personality_files(self):
         # Server should be created successfully if maximum allowed number of
diff --git a/tempest/api/compute/volumes/test_attach_volume.py b/tempest/api/compute/volumes/test_attach_volume.py
index caa445d..811b521 100644
--- a/tempest/api/compute/volumes/test_attach_volume.py
+++ b/tempest/api/compute/volumes/test_attach_volume.py
@@ -160,6 +160,9 @@
 
     This test checks the attaching and detaching volumes from
     a shelved or shelved offload instance.
+
+    Note that these are uncommon scenarios until blueprint detach-boot-volume
+    is implemented in the compute service.
     """
 
     min_microversion = '2.20'
@@ -220,6 +223,9 @@
                 server, validation_resources)
             self.assertEqual(number_of_volumes, counted_volumes)
 
+    # NOTE(mriedem): Marked as slow since this is an uncommon scenario until
+    # attach/detach root volume is supported in nova, and it's slow.
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('13a940b6-3474-4c3c-b03f-29b89112bfee')
     def test_attach_volume_shelved_or_offload_server(self):
         # Create server, count number of volumes on it, shelve
@@ -245,6 +251,9 @@
         # case of shelved_offloaded.
         self.assertIsNotNone(volume_attachment['device'])
 
+    # NOTE(mriedem): Marked as slow since this is an uncommon scenario until
+    # attach/detach root volume is supported in nova, and it's slow.
+    @decorators.attr(type='slow')
     @decorators.idempotent_id('b54e86dd-a070-49c4-9c07-59ae6dae15aa')
     def test_detach_volume_shelved_or_offload_server(self):
         # Count number of volumes on instance, shelve